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The trimeric ring helicate was obtained after diffusion of <jats:italic>n<\/jats:italic>\u2010pentane into a solution with dichloromethane. The circular helicate has been characterized by using single\u2010crystal X\u2010ray diffraction study, <jats:sup>13<\/jats:sup>C CP\u2010MAS NMR and <jats:sup>1<\/jats:sup>H\u2005NMR DOSY solution spectroscopic, and positive electrospray ionization mass\u2010spectrometric analysis. These analytical data were compared with those obtained from a previously reported double\u2010stranded helicate that crystallizes in toluene. The trimeric ring was unstable in a pure solution with dichloromethane and transformed into the double\u2010stranded helicate. Thermodynamic analysis by means of the PACHA software revealed that formation of the double\u2010stranded helicates was characterized by \u0394<jats:italic>H<\/jats:italic>(toluene)=\u221230\u2005kJ\u2009mol<jats:sup>\u22121<\/jats:sup> and \u0394<jats:italic>S<\/jats:italic>(toluene)=+357\u2005J\u2009K<jats:sup>\u22121<\/jats:sup>\u2009mol<jats:sup>\u22121<\/jats:sup>, whereas these values were \u0394<jats:italic>H<\/jats:italic>(CH<jats:sub>2<\/jats:sub>Cl<jats:sub>2<\/jats:sub>)=\u221275\u2005kJ\u2009mol<jats:sup>\u22121<\/jats:sup> and \u0394<jats:italic>S<\/jats:italic>(CH<jats:sub>2<\/jats:sub>Cl<jats:sub>2<\/jats:sub>)=\u221237\u2005J\u2009K<jats:sup>\u22121<\/jats:sup>\u2009mol<jats:sup>\u22121<\/jats:sup> for the ring helicate. The transformation of the ring helicate into the double\u2010stranded helicate was a strongly endothermic process characterized by \u0394<jats:italic>H<\/jats:italic>(CH<jats:sub>2<\/jats:sub>Cl<jats:sub>2<\/jats:sub>)=+127\u2005kJ\u2009mol<jats:sup>\u22121<\/jats:sup> and \u0394<jats:italic>H<\/jats:italic>(<jats:italic>n<\/jats:italic>\u2010pentane)=+644\u2005kJ\u2009mol<jats:sup>\u22121<\/jats:sup> associated with a large positive entropy change \u0394<jats:italic>S<\/jats:italic>=+1115\u2005J\u2009K<jats:sup>\u22121<\/jats:sup>\u22c5mol<jats:sup>\u22121<\/jats:sup>. Consequently, the instability of the ring helicate in pure dichloromethane was attributed to the rather high dielectric constant and dipole moment of dichloromethane relative to <jats:italic>n<\/jats:italic>\u2010pentane. Suggestions for increasing the stability of the ring helicate are given.<\/jats:p>","DOI":"10.1002\/chem.201304317","type":"journal-article","created":{"date-parts":[[2014,3,18]],"date-time":"2014-03-18T18:41:06Z","timestamp":1395168066000},"page":"5092-5101","source":"Crossref","is-referenced-by-count":32,"title":["A Remarkable Solvent Effect on the Nuclearity of Neutral Titanium(IV)\u2010Based Helicate Assemblies"],"prefix":"10.1002","volume":"20","author":[{"given":"David Michael","family":"Weekes","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carine","family":"Diebold","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pierre","family":"Mobian","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Clarisse","family":"Huguenard","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lionel","family":"Allouche","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marc","family":"Henry","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2014,3,18]]},"reference":[{"key":"e_1_2_6_1_2","first-page":"1257","volume-title":"Self\u2010Assembly in Biochemistry","author":"Hamilton T. 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